20
14 17 11 19 13 16 15 12 20 18 
13 17 20 15 18 12 14 11 16 19 
13 15 18 14 20 17 19 12 16 11 
13 18 19 14 12 17 16 15 20 11 
20 19 14 18 17 11 16 12 15 13 
15 17 11 18 20 14 13 12 16 19 
17 16 13 18 11 19 12 14 15 20 
16 17 15 13 14 20 11 19 12 18 
12 13 15 17 14 11 16 19 18 20 
15 14 20 12 17 18 16 13 19 11 
9 10 5 2 6 3 4 7 8 1 
4 9 6 10 1 8 2 7 3 5 
7 4 5 2 10 8 1 3 9 6 
4 7 6 9 8 10 1 2 5 3 
10 7 4 1 8 9 3 5 2 6 
8 10 3 7 6 1 5 4 2 9 
7 8 9 3 10 1 4 5 2 6 
6 3 4 10 1 7 9 5 8 2 
4 5 10 9 2 1 6 7 8 3 
9 5 1 3 10 7 2 6 8 4 
forbidden 1 12
forbidden 1 16
forbidden 1 19
forbidden 2 13
forbidden 2 18
forbidden 3 12
forbidden 3 14
forbidden 3 16
forbidden 4 14
forbidden 4 19
forbidden 5 12
forbidden 5 14
forbidden 5 17
forbidden 5 20
forbidden 6 13
forbidden 6 18
forbidden 6 20
forbidden 7 12
forbidden 7 13
forbidden 7 14
forbidden 7 15
forbidden 7 17
forbidden 7 18
forbidden 7 19
forbidden 8 13
forbidden 8 17
forbidden 8 19
forbidden 9 11
forbidden 9 16
forbidden 9 20
forbidden 10 11
forbidden 10 12
forbidden 10 14
forbidden 10 15
forbidden 10 16
forbidden 10 17